Internal-combustion engine



i 28 1927. June F. DURR INTERNAL COMBUSTION ENGINE Filed July 25, 1926FHI; Pfr

Patented June 28, 1927.

UNITED STATES IBITZ D''BB, 0l' MUNICH, GIRI-ANY. l

mrEaNAL-commrsrlon ENGINE.

Application 111ed`Ju1y 23, 1926,l Serial No. 124,381, and in Germanyinly 27, 1925.

My invention relates to improvements in internal combustion engines, andmore .particularly to two-cycle blower engines with a uniflow scaven ingsystem.

There are a ready known internal combustion engines, particularlytwo-cycle blower engines with uniflow scavenging, 1 n which thescavenging and the chargmg air are controlled b means of a rotary valve.I

My improve combustion engine of this type is distinguished from the.hitherto known engines by the injecting nozzle for the supply of theliquid fuel opening axla'lly into the tubular rotary valve and by thenecessary quantity of fuel being addedA to the charging airincountercurrent by means of a pump operating in the cycle of the rotaryvalve.

According to a further development of my invention a cam is provided.upon the rotary valve itself for the drive of the fuel pump.

In the drawing attached hereto one embodimentof my invention isillustrated by .way of example.

Referring to the single figure of the drawing which `illustrates alongitudinal section through my improved engine, 1 is the cylinder ofthe engine, and 2 the iston reciprocated therein by means of t econnecting rod 3. In the cylinder head is provided a tubular rotaryvalve 4 which ma be rotated by means of a sprocket wheel 5, or instance.Into this valve provided with a scavenging s'lot or port 6 projectsaxially the fuel nozzle 7. A cam 8 mounted upon the sprocket wheel 5forming an integral part of the rotary valve 4 operatesa ump lunger 10controlled by a spring 9, w ich p unger sucks in the fuel and forces itinto the nozzle 7 by means of non-return valves 11 and 12. The pumpchamber is sealed by a solid rotary valve 13. This rotary valve 13 isprovided with an eccentric groove 14 by means of which the pump chambercan be put in communication with the bypass '15 and thus with the fuelsupply pipe-16. The regulation'of the working volume of the pump iseffected by means of thehandle 17. y It will be readily understoodthatinstead of a piston pum any other suitable pump may be employet such asa gear Wheel pump or the like.

.My improved engine functions as follows: During the expansion stroke ofthe engine the rotary valve 4 is closed, i. e. the cylinder port iscovered so that the fresh air coming ,the actually supplied from theblower accumulates in the cylinder. Towards the lower dead center thepressure first' escapes through the exhaust slots 18, then the valveslot 6 opens and the fresh air accumulated by the blower Scavenges thecylinder. Now the fuel pump becomes operative by the plunger beingforced into the pump chamber by the cam and thus opening the non-returnvalve 12 and simultaneously closing the non-return valve 11 and ejectingtheffuel through the nozzle 7.

The quantity of the ejected' fuel depends upon the position of thehandle 17. If the eccentric groove provides an unobstructedcommunication between the ump chamber and the fuel supply pipe 16, t eentire quantity of fuel set in motion by the plunger is forced back intothe supply pipe 16 because the resistance of the capillary nozzle 7 isgreater than the resistance of the bypass. The more this bypass isthrottled by a corresponding adjustment of the valve 13 the more fuelissues from the nozzle 7. By an accurate adjustment of the pump valve 13uantit of fuel 4can be at an time easily dlminis ed to the desired vaue.

Various modifications and changes may be made without departing from thespirit and thev scope of the invention, and I desire.-

combination, a rotary tubular valve for controlling the scavenging andthe charging.

air, a fuel injecting nozzle opening axially into said valve, a fuelsupply pump, a cam on the face of said valve and adapted to opcrate saidpump and to supply .the fuel to the charge air in countercurrent.

3. In anl internal combustion engine, in

combination, a cylinder, a piston in said cylinder, a crank shaft, aconnecting rod between said piston and said crank shaft, a

tubular rotary valve located in the head ofsaid cylinder, means forrevolving said valve lll) nozzle, and non-return valves in said pipe andsaid conduit.

4. In an internal `combustlon engine, 1n combination, a: cylinder, aplston 1n said cylinder, a crank shaft, a connecting rod be? tween saidpiston and said crank shaft, a tubular rotary valve located in the headof sa-id cylinder, means for revolving said valve provided with a port,a fuel nozzle losignature.

cated axially in said valve, a. cam on the outer face of said valve, aspring-controlled pump plunger adapted to be operated by said cam, apump chamber for said plunger, a fuel supply pipe opening i'nto saidchamber, a conduit connecting said chamberwith said nozzle, non-returnvalves in said pipe and said conduit, a'. rotary valve for sealing saidpump chamber, a handle for rotating said Valve, an eccentric groove insaid valve, and a bypass leading from the chamber of said valve intosa'id fuel supply pipe and adapted to be controlled by said groove.

In testimony whereof I have affixed my FRITZ DRR.

